2010A&A...510L...8S


Query : 2010A&A...510L...8S

2010A&A...510L...8S - Astronomy and Astrophysics, volume 510, L8-8 (2010/2-1)

ULAS J141623.94+134836.3 - a faint common proper motion companion of a nearby L dwarf. Serendipitous discovery of a cool brown dwarf in UKIDSS DR6.

SCHOLZ R.-D.

Abstract (from CDS):

New near-infrared large-area sky surveys (e.g. UKIDSS, CFBDS, WISE) go deeper than 2MASS and aim at detecting brown dwarfs lurking in the solar neighbourhood that are even fainter than the latest known T-type objects, so-called Y dwarfs. Using UKIDSS data, we found a faint brown dwarf candidate with very red optical-to-near-infrared, but extremely blue near-infrared colours next to the recently discovered nearby L dwarf SDSS J141624.08+134826.7. We checked if the two objects are co-moving by studying their parallactic and proper motion and compared the new object with known T dwarfs. The astrometric measurements are consistent with a physical pair (sep≃75AU) at a distance d≃8pc. The extreme colour (J-K≃-1.7) and absolute magnitude (MJ=17.78±0.46 and MK=19.45±0.52) make the new object appear as one of the coolest (Teff≃600K) and nearest brown dwarfs, probably of late-T spectral type and possibly with a high surface gravity (logg≃5.0).

Abstract Copyright:

Journal keyword(s): astrometry - stars: distances - stars: kinematics and dynamics - brown dwarfs - solar neighborhood

Simbad objects: 8

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Number of rows : 8
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 CFBDS J003402-005206 BD* 00 34 02.77416 -00 52 06.8196           T8+/Y? 49 0
2 CFBDS J005910-011401 BD* 00 59 10.46265 -01 14 00.5404           T9.0 38 0
3 ULAS J123828.51+095351.3 BD* 12 38 28.50864 +09 53 51.3636           T8.5(N) 17 0
4 ULAS J133553.45+113005.2 BD* 13 35 53.45352 +11 30 05.1444           T8+/Y? 38 0
5 ULAS J141623.94+134836.3 BD* 14 16 23.94216 +13 48 36.3204           T7.5p 56 0
6 2MASS J14162408+1348263 BD* 14 16 24.0739698960 +13 48 26.193281184           L5 80 0
7 Wolf 940 B BD* 21 46 38.829 -00 10 38.59           T8+/Y? 57 0
8 Wolf 940 PM* 21 46 40.4228878204 -00 10 23.771502145   14.31 12.70 12.42   dM4.0 70 0

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